I have been using LinkedIn for 4 years (33K followers). Last year, I started using Twitter (3K followers). All inbound.
What works best depends on your product and your audience.
LinkedIn is the best for B2B. Twitter is the best for building in public B2C, and it works for cheap B2B, too.
For my service business, LinkedIn works better. But my clients like that I use Twitter, too.
For selling digital products, both platforms work well.
Share your experience, please :)
If we're not connected:
My LinkedIn:
https://www.linkedin.com/in/olen...
My Twitter:
https://twitter.com/olenabomko
Cello